浅谈LLC变压器设计经历

LLCLLCMOSMOS;;MOSMOS;BmLLC?LLCLCLCQQ1;LLC?LLC(Skineffect)(Proximityeffect)LLC11,?1,1,2,E=4.44fN?mE--f--N--?m--E1E212(0)20,2,2?LLCLEDTVLLCLLCICLLCLLCLEDTVLLC1()ZVS(zerovoltageswitching)23LLCZVS(aboveregion)()()LLC1LLCLLC1LLCLLCMOSFET50%MOSFETVout(PFM)LrLmCr(1)2(sectionalbobbin)LmLlk(1)VdVin/2Rac8n2Vout/2Iout22LLC2LpCrpLrCrrLLC32(a)(b)3LLC3prrZVS(2)LLC3LLCZCS()()ZVS()()ZVSr(belowregion)(aboveregion)LLCZCSMOSFETLLCZVSMOSFETLLCZCSrLLCLLCMOSFETMOSFETUF()LCDMOSFET/LEDPDPTVLLCLLC4LLC100%10%fop@10%loadfop@100%loadLLC100%10%Vin,maxMfrfrZVS/Vin,maxMfrMfrLLCMfrfrLEDTVPFC()350380400Vdc120V/1.5AMOSFETFSFR4LLC1mfrMfr2frMfr(3)3mfrmLrmLrmLrLpm47mfr6kHz100kHz1.0924Mmin=(Vvirtual/Vin,max)MfrMmax=Vvirtual/VinminMfr(4)MminMmaxVvirtualVvirtualVin,maxLLCVirtual420VdcMminMmax4Mmin=420/4001.1=1.16/Mmax=420/3501.1=1.3110%Mmax1.4532VvirtualMfr5n=Vvirtual/2(Vout+VF)(5)VoutVFn2Vvirtual2Vvirtual420VdcVF1Vdcn=420/2(120+1)1.1=1.945mQ5mQm5QQ6Cr=1/(2QfrRacLr=1/(2fr)2CrLp=Lr(6)CrLrLpm6Mmax1.455MmaxQ0.35100kHzCr19.1nF22nFLr=115HLp=690H